Dooe speing and check



(No Model.) 2 Sheets-Sheet 1.

V J. WOLF. DOOR SPRING AND CHECK.

N0. 484,838. Patented Oct. 25, 1892.

WITNESSES: I INVENTOR- I sef QL ZI', I

15% WATT Y' (No Model.) 2 Sheets-Sheet 2.

' J. WOLF.

DOOR SPRING AND CHECK.

NO. 484,888. Patented Oct. 25, 1892..

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UNiTED STATES PATENT OFFICE JOSEF WOLF, OF NEWARK, NEW JERSEY, ASSIGNORTO ALBERT V. WVIDMANN AND JOHN COPPERSMITH, OF SAME PLACE.

DOOR SPRING-AND CHECK.

SPECIFICATION formingpart of Letters Patent No. 484,838, dated October25, 1892. Application filed February 20, 1892. Serial No.422,209. (N0model.)

To cal Z whom it may concern:

Be it known that I, J OSEF WOLF, a citizen of the United States,residing at Newark, in the county of Essex and State of New Jersey, haveinvented certain new and useful Improve ments in Door-Springs; and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same, reference being had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification.

My present invention relates to an improved door spring and checkadapted for use on doors or gates to automatically close the same whenopened and to prevent the slamming by the interposition of an additionalspring in' the cylinder; and it consists in various improvements in thedetails of the device, such as will be hereinafter more fully described,and finally embodied in the claims.

In the drawings, Figure 1 is a top View of my combined door spring andcheck. Fig. 2 is a side View, and Fig. 3 a bottom view, of the same;Fig. 4 is avertical longitudinal section of the door-spring; and Fig. 5is a cross-section of the same, taken on line 00 in said Fig. 4. Fig. 6is a view similar to Fig. 4, illustrating the positions of the severalparts of the device when the door has been opened. Fig. 7 is a view ofthe under side of a slightly-modified construction, and Fig. 8 is avertical longitudinal section of the same. Fig. 9 is plan view of stillanother modified form of construction embodying the same principle, andFig. 10 is a vertical longitudinal section of the same. Fig. 11 is acrossseetion of the cylinder, shown in connection with a guide having aroller in the top thereof.

Similar letters of reference are employed in each of the above-describedviews to indicate corresponding parts.

In the several views of the drawings, a indicates the door, and b thedoor-frame.

The improved door-spring consists of the leaf 0, adapted to be securedwith screws to the door-frame b, and the cylinder 0', provided at itsfree end with ears 0 between which I arrange a roller d. As will be seenfrom the several figures of the drawings, said leaf or plate 0 hasupwardly-extending ears and said cylinder 0 has correspondingly-arrangedears 0, and said ears are pivotally connected by means of a pin 0substantially as shown.

The cylinder 0, which may be entirely closed or may be skeleton shaped,as shown in Figs. 1 and 2, has arranged therein a rod e, provided with asuitable piston e, to which it may be securely riveted, or said pistoncan be slotted,'as shown, in which case the rod 6 is provided with ahead e and can be removably arranged in said cylinder. At the other endsaid rod 6 is connected by means of pivoted links f with acomparatively-short bar 9, having oppositely-projecting arms g, asshown. The arms g are hooked over the hook-arms 0 extending up from theleaf 0, and around said rod e is placed a helical spring e these severalparts of the mechanism thus forming a complete door-spring, as will beevident.

The cylinder 0', as shown, extends back, being provided in its upperside with a slot 0 in which moves a pin or rivet 0 to which is securedwithin the cylinder 0 aslide or follower h, of any suitableconstruction, provided with a backwardly-extending pin h and a spring 71having its ends abutting against one end of said slide it and againstthe inner end 0 of the cylinder, as shown. Now when the door has beenopened, the spring, the piston 9, rod eand its spring, and the leaf 0,and the flexible connecting mechanism of'the door-spring assume thepositions illustrated in Fig. 6, and the spring k which is of lesstension than spring a and hence has been compressed, is now free toextend, and forces the follower it forward until the pin 0 has movedagainst the forward end of the slot 0 as shown in said Fig. 6. As soonas theperson entering has let go his hold on the door the spring e andthe intermediatelyarranged mechanism in that part of the cylinder c tendto resume their normal inoperative positions, (illustrated in Fig. 3,)and as the spring e thus suddenly causes the door to return to itsclosed position, the end 6 of the rod e suddenly comes in contact withthe forwardly-extending follower or slide h, and the quick-closingmovement is suddenly checked by the resistance offered by the spring band owing to the increased expansive power of the spring a said spring hand the follower h slowly assume their positions shown in said Fig. 3,while the door slowly closes and without a slam. Of course'it will beevident that in place of the spring h I can use a piece of rubber, whichis the equivalent of a spring.

As will be seen from the figures, the leaf 0 only is secured by screwsto the door-frame, while the cylinder 0' is not fastened at all, for theaction of the spring 6 is to constantly hold the cylinder againstthedoor upon which it slides, being provided with the roller d,hereinbefore mentioned.

In lieu of the construction of the leaf 0, (shown in Figs. 1 to 6,inclusive,) said leaf may be provided with an upwardly-extending portion0 to which the ears of the cylinder c are pivoted, said portion 0 beingprovided with an outwardly-extending per forated arm 0, connected byseveral links f to theforward end of the rod 2. Said arm 0 can be castintegral with the portion c on the leaf 0, or it can be made of aseparate piece of strong sheet metal placed in the sand before casting,around which the metal flows, and hence forms one piece with the portion0, in which it becomes firmly embedded.

The arrangement of the springs in the cylinder and their connectingparts can be similarly placed to those shown in the above-describedfigures. In Figs. 7 and 8, however, I have shown a slightly-modifiedform of construction. The follower in this case is cylindrical, beingsecured beneath the slot 0 in the cylinder by the screw or pin 0 but therod e in this case extends back in an arm 6 which passes through a boreformed in the follower and its backwardly-extending, pin it, aroundwhich the spring 72 is coiled.

The operation of this form of door-spring is similar to that justdescribed in reference to Figs. 1 to 6, inclusive, as will be evidentfrom the drawings.

In the construction illustrated in Figs. 9 and 10 the several parts ofthe device are detachably secured together to enable the taking down ofa door without disturbing the working parts thereof.

The construction and arrangement of these and therefore I willnotdescribe this construction further. In this form of construction thecylinder moves under a guide i,preferably provided in the top thereofwith a roller 11, as shown.

Having thus described my invention, what I claim is- 1. Theherein-described door-spring, comprising therein, in combination, a leafadapted to be secured to the door-frame, and a cylinder 0', providedwith an opening or slot 0 a piston-rod e and a piston e in saidcylinder, and a coiled spring a, encircling said rod, means forpivotally connecting said rod with the leaf secured to the door-frame, afollower or slide provided with a pin extending up into said slot 0 tolimit its movement, a backwardly-extending pin 72/ on said follower orslide, and a spring h ,,encircling said pin h to force said follower orslide forward when the piston e has moved forward, substantially 75 asand for the purposes set forth.

2. The herein-described door-spring, comprising therein, in combination,a leaf adapted to be secured to thedoor-frame, and a cylinder 0',provided with an opening or slot 0 a piston-rod eand a piston e in saidcylinder, and a coiled spring e encircling said rod, means forpivot'ally connecting said rod with the leaf on the door-frame, afollower or slide provided with a pin extending up into said slot 0 tolimit its movement, a backwardlyextending pin h on said follower orslide, said follower or slide and said pin h being tubular and said rode having a backwardlyextending arm 6 projecting into said tubular 9ofollower or slide and pin, and a spring encircling said pin on thefolloweror slide to force the same forward when the piston 6 movesforward, substantially as and for the purposes set forth.

In testimony that I claim the invention set forth above I have hereuntoset my hand this 17th day of February, 1892.

. JOSEF WOLF. Witnesses:

FREDK. O. FRAENTZEL, WM. 11. CAMFIELD, Jr.

